exception handling

.idea/deploymentTargetDropDown.xml

@@ -1,17 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="deploymentTargetDropDown">
-    <runningDeviceTargetSelectedWithDropDown>
-      <Target>
-        <type value="RUNNING_DEVICE_TARGET" />
-        <deviceKey>
-          <Key>
-            <type value="SERIAL_NUMBER" />
-            <value value="KFRSEQ6DTWWWQOE6" />
-          </Key>
-        </deviceKey>
-      </Target>
-    </runningDeviceTargetSelectedWithDropDown>
-    <timeTargetWasSelectedWithDropDown value="2023-12-17T14:14:18.887820Z" />
-  </component>
-</project>

app/src/main/java/com/example/myapplication/MainComposeActivity.kt

@@ -1,5 +1,6 @@
 package com.example.myapplication
 
+import android.content.Context
 import android.os.Bundle
 import androidx.activity.ComponentActivity
 import androidx.activity.compose.setContent
@@ -20,6 +21,7 @@ class MainComposeActivity : ComponentActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         application.deleteDatabase("pmy-db")
+        appContext = applicationContext
         setContent {
             PmudemoTheme(darkTheme = isDarkTheme.value) {
                 LaunchedEffect(key1 = true) {
@@ -40,4 +42,7 @@ class MainComposeActivity : ComponentActivity() {
             }
         }
     }
+    companion object {
+        lateinit var appContext: Context
+    }
 }

app/src/main/java/com/example/myapplication/composeui/Authenticator.kt

@@ -15,21 +15,17 @@ fun Authenticator(
     viewModel: AuthenticatorViewModel = viewModel(factory = AppViewModelProvider.Factory)
 ) {
     val scope = rememberCoroutineScope()
-
     val login = dataStoreManager.getLogin().collectAsState(initial = "").value
 
+    LiveStore.user.value = viewModel.authUiState.user
+
     fun synchronize() {
         scope.launch {
             if (login == "") {
                 LiveStore.user.value = null
                 return@launch
             }
-            val overlap = viewModel.findUserByLogin(login)
+            viewModel.findUserByLogin(login)
-            if (overlap == null) {
-                dataStoreManager.setLogin("")
-                return@launch
-            }
-            LiveStore.user.value = overlap
         }
     }
 

app/src/main/java/com/example/myapplication/composeui/AuthenticatorViewModel.kt

@@ -1,18 +1,27 @@
 package com.example.myapplication.composeui
 
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.setValue
 import com.example.myapplication.database.entities.model.User
 import com.example.myapplication.database.entities.repository.UserRepository
 
 class AuthenticatorViewModel(
     private val userRepository: UserRepository
 ) : MyViewModel() {
-    suspend fun findUserByLogin(login: String): User? {
+    var authUiState by mutableStateOf(AuthenticatorUiState())
-        var user: User? = null
+        private set
+
+    suspend fun findUserByLogin(login: String) {
         runInScope(
             actionSuccess = {
-                user = userRepository.getUser(login)
+                authUiState = AuthenticatorUiState(userRepository.getUser(login))
+            },
+            actionError = {
+                authUiState = AuthenticatorUiState()
             }
         )
-        return user
     }
-}
+}
+
+data class AuthenticatorUiState(val user: User? = null)

app/src/main/java/com/example/myapplication/composeui/Cart.kt

@@ -60,7 +60,6 @@ fun Cart(
     LaunchedEffect(Unit) {
         viewModel.refreshState()
     }
-
     Cart(
         cartUiState = cartUiState,
         modifier = Modifier

app/src/main/java/com/example/myapplication/composeui/CartViewModel.kt

@@ -3,7 +3,6 @@ package com.example.myapplication.composeui
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.setValue
-import androidx.lifecycle.ViewModel
 import com.example.myapplication.LiveStore
 import com.example.myapplication.database.entities.model.Order
 import com.example.myapplication.database.entities.model.OrderSessionCrossRef
@@ -21,15 +20,21 @@ class CartViewModel(
     private val orderRepository: OrderRepository,
     private val orderSessionRepository: OrderSessionRepository,
     private val userRepository: UserRepository,
-) : ViewModel() {
+) : MyViewModel() {
     private var isLoading: Boolean = false
     var cartUiState by mutableStateOf(CartUiState())
         private set
 
     suspend fun refreshState() {
         val userId: Int = LiveStore.user.value?.uid ?: 0
-        val cart = userRepository.getCartByUser(userId)
+        runInScope(
-        cartUiState = CartUiState(cart)
+            actionSuccess = {
+                val cart = userRepository.getCartByUser(userId)
+                cartUiState = CartUiState(cart)
+            }, actionError = {
+                cartUiState = CartUiState()
+            }
+        )
     }
 
     suspend fun addToOrder(sessions: List<SessionFromCart>) {
@@ -39,38 +44,61 @@ class CartViewModel(
         val userId: Int = LiveStore.user.value?.uid ?: return
         if (sessions.isEmpty())
             return
-        val orderId = orderRepository.insertOrder(Order(0, userId, LocalDateTime.now()))
+        runInScope(
-        sessions.forEach { session ->
+            actionSuccess = {
-            orderSessionRepository.insertOrderSession(
+                val orderId = orderRepository.insertOrder(Order(0, userId, LocalDateTime.now()))
-                OrderSessionCrossRef(
+                sessions.forEach { session ->
-                    orderId.toInt(),
+                    orderSessionRepository.insertOrderSession(
-                    session.uid,
+                        OrderSessionCrossRef(
-                    session.price,
+                            orderId.toInt(),
-                    session.count
+                            session.uid,
-                )
+                            session.price,
-            )
+                            session.count
-        }
+                        )
-        userSessionRepository.deleteUserSessions(userId)
+                    )
-        refreshState()
+                }
+                userSessionRepository.deleteUserSessions(userId)
+                refreshState()
+            }
+        )
     }
 
     suspend fun removeFromCart(session: Session, count: Int = 0) {
         val userId: Int = LiveStore.user.value?.uid ?: return
-        userSessionRepository.deleteUserSession(UserSessionCrossRef(userId, session.uid, count))
+        runInScope(
-        refreshState()
+            actionSuccess = {
+                userSessionRepository.deleteUserSession(
+                    UserSessionCrossRef(
+                        userId,
+                        session.uid,
+                        count
+                    )
+                )
+                refreshState()
+            }
+        )
     }
 
-    suspend fun updateFromCart(session: Session, count: Int, availableCount: Int): Boolean {
+    suspend fun updateFromCart(session: Session, count: Int, availableCount: Int) {
-        val userId: Int = LiveStore.user.value?.uid ?: return false
+        val userId: Int = LiveStore.user.value?.uid ?: return
         if (count == 0) {
             removeFromCart(session, count)
-            return false
+            return
         }
         if (count > availableCount)
-            return false
+            return
-        userSessionRepository.updateUserSession(UserSessionCrossRef(userId, session.uid, count))
+        runInScope(
-        refreshState()
+            actionSuccess = {
-        return true
+                userSessionRepository.updateUserSession(
+                    UserSessionCrossRef(
+                        userId,
+                        session.uid,
+                        count
+                    )
+                )
+                refreshState()
+            }
+        )
     }
 }
 

app/src/main/java/com/example/myapplication/composeui/Report.kt

@@ -25,6 +25,7 @@ import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.unit.dp
 import androidx.lifecycle.viewmodel.compose.viewModel
+import com.example.myapplication.api.ApiStatus
 import com.example.myapplication.api.session.ReportRemote
 import com.example.myapplication.database.entities.composeui.AppViewModelProvider
 import kotlinx.coroutines.launch
@@ -39,57 +40,68 @@ fun Report(
     val dateStateStart = rememberDatePickerState(initialDisplayMode = DisplayMode.Input)
     val dateStateEnd = rememberDatePickerState(initialDisplayMode = DisplayMode.Input)
     val coroutineScope = rememberCoroutineScope()
-    Column(
+
-        modifier = Modifier
+    when (viewModel.apiStatus) {
-            .verticalScroll(rememberScrollState())
+        ApiStatus.DONE -> {
-            .fillMaxWidth()
+            Column(
-            .padding(all = 10.dp),
+                modifier = Modifier
-        verticalArrangement = Arrangement.Center,
+                    .verticalScroll(rememberScrollState())
-        horizontalAlignment = Alignment.CenterHorizontally
+                    .fillMaxWidth()
-    )
+                    .padding(all = 10.dp),
-    {
+                verticalArrangement = Arrangement.Center,
-        Text(
+                horizontalAlignment = Alignment.CenterHorizontally
-            text = "Начало периода",
-            style = MaterialTheme.typography.headlineLarge
-        )
-        DatePicker(state = dateStateStart)
-        val selectedDateStart = dateStateStart.selectedDateMillis
-        if (selectedDateStart != null) {
-            viewModel.onUpdate(
-                viewModel.reportUiState.reportDetails.copy(
-                    startDate =
-                    Date(selectedDateStart)
-                )
             )
-        } else {
+            {
-            viewModel.onUpdate(viewModel.reportUiState.reportDetails.copy(startDate = Date(0)))
+                Text(
-        }
+                    text = "Начало периода",
-        Text(
+                    style = MaterialTheme.typography.headlineLarge
-            text = "Конец периода",
-            style = MaterialTheme.typography.headlineLarge
-        )
-        DatePicker(state = dateStateEnd)
-        val selectedDateEnd = dateStateEnd.selectedDateMillis
-        if (selectedDateEnd != null) {
-            viewModel.onUpdate(
-                viewModel.reportUiState.reportDetails.copy(
-                    endDate =
-                    Date(selectedDateEnd)
                 )
-            )
+                DatePicker(state = dateStateStart)
-        } else {
+                val selectedDateStart = dateStateStart.selectedDateMillis
-            viewModel.onUpdate(viewModel.reportUiState.reportDetails.copy(endDate = Date(0)))
+                if (selectedDateStart != null) {
+                    viewModel.onUpdate(
+                        viewModel.reportUiState.reportDetails.copy(
+                            startDate =
+                            Date(selectedDateStart)
+                        )
+                    )
+                } else {
+                    viewModel.onUpdate(viewModel.reportUiState.reportDetails.copy(startDate = Date(0)))
+                }
+                Text(
+                    text = "Конец периода",
+                    style = MaterialTheme.typography.headlineLarge
+                )
+                DatePicker(state = dateStateEnd)
+                val selectedDateEnd = dateStateEnd.selectedDateMillis
+                if (selectedDateEnd != null) {
+                    viewModel.onUpdate(
+                        viewModel.reportUiState.reportDetails.copy(
+                            endDate =
+                            Date(selectedDateEnd)
+                        )
+                    )
+                } else {
+                    viewModel.onUpdate(viewModel.reportUiState.reportDetails.copy(endDate = Date(0)))
+                }
+                Button(
+                    onClick = { coroutineScope.launch { viewModel.getReport() } },
+                    enabled = viewModel.reportUiState.isEntryValid,
+                    shape = MaterialTheme.shapes.small,
+                    modifier = Modifier.fillMaxWidth()
+                ) {
+                    Text(text = "Получить отчет")
+                }
+                Spacer(modifier = Modifier.height(16.dp))
+                CardScreen(reportData = viewModel.reportResultUiState.report)
+            }
         }
-        Button(
+
-            onClick = { coroutineScope.launch { viewModel.getReport() } },
+        ApiStatus.LOADING -> LoadingPlaceholder()
-            enabled = viewModel.reportUiState.isEntryValid,
+        else -> ErrorPlaceholder(
-            shape = MaterialTheme.shapes.small,
+            message = viewModel.apiError,
-            modifier = Modifier.fillMaxWidth()
+            onBack = { }
-        ) {
+        )
-            Text(text = "Получить отчет")
-        }
-        Spacer(modifier = Modifier.height(16.dp))
-        CardScreen(reportData = viewModel.reportResultUiState.report)
     }
 }
 

app/src/main/java/com/example/myapplication/composeui/ReportViewModel.kt

@@ -3,12 +3,11 @@ package com.example.myapplication.composeui
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.setValue
-import androidx.lifecycle.ViewModel
 import com.example.myapplication.api.session.ReportRemote
 import com.example.myapplication.api.session.RestSessionRepository
 import java.util.Date
 
-class ReportViewModel(private val serialRepository: RestSessionRepository) : ViewModel() {
+class ReportViewModel(private val serialRepository: RestSessionRepository) : MyViewModel() {
     var reportUiState by mutableStateOf(ReportUiState())
         private set
 
@@ -32,11 +31,17 @@ class ReportViewModel(private val serialRepository: RestSessionRepository) : Vie
 
     suspend fun getReport() {
         if (validateInput()) {
-            val temp = serialRepository.getReport(
+            runInScope(
-                reportUiState.reportDetails.startDate,
+                actionSuccess = {
-                reportUiState.reportDetails.endDate
+                    val temp = serialRepository.getReport(
+                        reportUiState.reportDetails.startDate,
+                        reportUiState.reportDetails.endDate
+                    )
+                    reportResultUiState = ReportResultUiState(temp)
+                }, actionError = {
+                    reportResultUiState = ReportResultUiState()
+                }
             )
-            reportResultUiState = ReportResultUiState(temp)
         }
     }
 }

app/src/main/java/com/example/myapplication/composeui/navigation/MainNavbar.kt

@@ -93,22 +93,21 @@ fun Topbar(
 
             Spacer(modifier = Modifier.width(16.dp))
 
-            if (currentScreen?.route == Screen.CinemaList.route) {
+            Search(
-                Search(
+                initValue = LiveStore.searchRequest.value ?: "",
-                    initValue = LiveStore.searchRequest.value ?: "",
+                onDone = {
-                    onDone = {
+                    navController.navigate(Screen.CinemaList.route)
-                        LiveStore.searchRequest.value = it
+                    LiveStore.searchRequest.value = it
-                    },
+                },
-                    modifier = Modifier
+                modifier = Modifier
-                        .weight(1f)
+                    .weight(1f)
-                        .height(36.dp)
+                    .height(36.dp)
-                        .background(
+                    .background(
-                            color = MaterialTheme.colorScheme.onPrimary,
+                        color = MaterialTheme.colorScheme.onPrimary,
-                            RoundedCornerShape(18.dp)
+                        RoundedCornerShape(18.dp)
-                        )
+                    )
-                        .padding(start = 13.dp, top = 8.dp)
+                    .padding(start = 13.dp, top = 8.dp)
-                )
+            )
-            }
         }
     }
 }
@@ -188,7 +187,7 @@ fun Navhost(
             Screen.OrderView.route,
             arguments = listOf(navArgument("id") { type = NavType.IntType })
         ) { backStackEntry ->
-            backStackEntry.arguments?.let { OrderView(it.getInt("id")) }
+            backStackEntry.arguments?.let { OrderView(navController) }
         }
         composable(Screen.Report.route) { Report() }
     }

app/src/main/java/com/example/myapplication/database/entities/composeui/CinemaList.kt

@@ -56,7 +56,6 @@ fun CinemaList(
     LaunchedEffect(searchPattern.value) {
         viewModel.refresh()
     }
-
     Scaffold(
         topBar = {},
         floatingActionButton = {
@@ -99,6 +98,7 @@ fun CinemaList(
     }
 }
 
+
 @Composable
 private fun CinemaList(
     modifier: Modifier = Modifier,

app/src/main/java/com/example/myapplication/database/entities/composeui/CinemaListViewModel.kt

@@ -21,12 +21,16 @@ class CinemaListViewModel(
 
     fun refresh() {
         val name = "%${LiveStore.searchRequest.value}%"
-        val pagingSource = cinemaRepository.getAllCinemas(name)
+        runInScope(actionSuccess = {
-        cinemaPagingFlow = CinemaPagingFlowState(pagingSource.cachedIn(viewModelScope))
+            val pagingSource = cinemaRepository.getAllCinemas(name)
+            cinemaPagingFlow = CinemaPagingFlowState(pagingSource.cachedIn(viewModelScope))
+        })
     }
 
     suspend fun deleteCinema(cinema: Cinema) {
-        cinemaRepository.deleteCinema(cinema)
+        runInScope(actionSuccess = {
+            cinemaRepository.deleteCinema(cinema)
+        })
     }
 }
 

app/src/main/java/com/example/myapplication/database/entities/composeui/CinemaView.kt

@@ -31,6 +31,9 @@ import androidx.compose.ui.unit.sp
 import androidx.lifecycle.viewmodel.compose.viewModel
 import androidx.navigation.NavController
 import com.example.myapplication.LiveStore
+import com.example.myapplication.api.ApiStatus
+import com.example.myapplication.composeui.ErrorPlaceholder
+import com.example.myapplication.composeui.LoadingPlaceholder
 import com.example.myapplication.composeui.navigation.Screen
 import com.example.myapplication.database.entities.model.Cinema
 import com.example.myapplication.database.entities.model.UserRole
@@ -42,104 +45,112 @@ fun CinemaView(
 ) {
     val cinemaUiState = viewModel.cinemaUiState
     val user = LiveStore.user.observeAsState()
-
     LaunchedEffect(Unit) {
         viewModel.refreshState()
     }
-
+    when (viewModel.apiStatus) {
-    Column(
+        ApiStatus.DONE -> {
-        modifier = Modifier
+            Column(
-            .padding(16.dp)
-            .fillMaxSize(),
-    ) {
-        val cinema: Cinema? = cinemaUiState.cinemaWithSessions?.cinema
-        if (cinema != null) {
-            Box(
                 modifier = Modifier
-                    .background(
+                    .padding(16.dp)
-                        color = MaterialTheme.colorScheme.secondary,
+                    .fillMaxSize(),
-                        shape = RoundedCornerShape(16.dp)
-                    )
             ) {
-                Column(
+                val cinema: Cinema? = cinemaUiState.cinemaWithSessions?.cinema
-                    modifier = Modifier
+                if (cinema != null) {
-                        .fillMaxWidth()
+                    Box(
-                        .padding(16.dp)
+                        modifier = Modifier
-                        .background(color = MaterialTheme.colorScheme.secondary),
+                            .background(
-                    verticalArrangement = Arrangement.spacedBy(8.dp)
+                                color = MaterialTheme.colorScheme.secondary,
-                ) {
+                                shape = RoundedCornerShape(16.dp)
-                    Row(
+                            )
-                        modifier = Modifier.fillMaxWidth(),
-                        horizontalArrangement = Arrangement.SpaceBetween,
                     ) {
-                        Text(
+                        Column(
-                            text = "${cinema.name}, ${cinema.year}",
-                            style = TextStyle(
-                                fontWeight = FontWeight.Bold,
-                                fontSize = 18.sp,
-                                color = MaterialTheme.colorScheme.onSecondary
-                            ),
-                            modifier = Modifier
-                                .padding(bottom = 8.dp)
-                        )
-                    }
-
-                    if (cinema.image != null)
-                        Image(
-                            bitmap = BitmapFactory.decodeByteArray(
-                                cinema.image,
-                                0,
-                                cinema.image.size
-                            ).asImageBitmap(),
-                            contentDescription = null,
                             modifier = Modifier
                                 .fillMaxWidth()
-                                .height(200.dp)
+                                .padding(16.dp)
-                                .padding(4.dp)
+                                .background(color = MaterialTheme.colorScheme.secondary),
-                        )
+                            verticalArrangement = Arrangement.spacedBy(8.dp)
+                        ) {
+                            Row(
+                                modifier = Modifier.fillMaxWidth(),
+                                horizontalArrangement = Arrangement.SpaceBetween,
+                            ) {
+                                Text(
+                                    text = "${cinema.name}, ${cinema.year}",
+                                    style = TextStyle(
+                                        fontWeight = FontWeight.Bold,
+                                        fontSize = 18.sp,
+                                        color = MaterialTheme.colorScheme.onSecondary
+                                    ),
+                                    modifier = Modifier
+                                        .padding(bottom = 8.dp)
+                                )
+                            }
 
-                    Text(
+                            if (cinema.image != null)
-                        text = cinema.description,
+                                Image(
-                        color = MaterialTheme.colorScheme.onSecondary
+                                    bitmap = BitmapFactory.decodeByteArray(
-                    )
+                                        cinema.image,
-                }
+                                        0,
-            }
+                                        cinema.image.size
-        }
+                                    ).asImageBitmap(),
+                                    contentDescription = null,
+                                    modifier = Modifier
+                                        .fillMaxWidth()
+                                        .height(200.dp)
+                                        .padding(4.dp)
+                                )
 
-        Row(
+                            Text(
-            verticalAlignment = Alignment.CenterVertically
+                                text = cinema.description,
-        ) {
+                                color = MaterialTheme.colorScheme.onSecondary
-            Text(
-                text = "Сеансы",
-                style = TextStyle(
-                    fontWeight = FontWeight.Bold,
-                    fontSize = 18.sp,
-                    color = MaterialTheme.colorScheme.onBackground
-                ),
-                modifier = Modifier
-                    .weight(1f) // Занимает доступное пространство
-                    .padding(top = 8.dp, bottom = 8.dp)
-            )
-            if (user.value?.role == UserRole.ADMIN) {
-                IconButton(
-                    onClick = {
-                        val route = Screen.SessionEdit.route.replace("{id}", 0.toString())
-                            .replace(
-                                "{cinemaId}",
-                                cinemaUiState.cinemaWithSessions?.cinema?.uid.toString()
                             )
-                        navController.navigate(route)
+                        }
                     }
+                }
+
+                Row(
+                    verticalAlignment = Alignment.CenterVertically
                 ) {
-                    Icon(
+                    Text(
-                        imageVector = Icons.Filled.Add,
+                        text = "Сеансы",
-                        contentDescription = "Добавить сеанс",
+                        style = TextStyle(
+                            fontWeight = FontWeight.Bold,
+                            fontSize = 18.sp,
+                            color = MaterialTheme.colorScheme.onBackground
+                        ),
+                        modifier = Modifier
+                            .weight(1f) // Занимает доступное пространство
+                            .padding(top = 8.dp, bottom = 8.dp)
                     )
+                    if (user.value?.role == UserRole.ADMIN) {
+                        IconButton(
+                            onClick = {
+                                val route = Screen.SessionEdit.route.replace("{id}", 0.toString())
+                                    .replace(
+                                        "{cinemaId}",
+                                        cinemaUiState.cinemaWithSessions?.cinema?.uid.toString()
+                                    )
+                                navController.navigate(route)
+                            }
+                        ) {
+                            Icon(
+                                imageVector = Icons.Filled.Add,
+                                contentDescription = "Добавить сеанс",
+                            )
+                        }
+                    }
+                }
+                if (cinemaUiState.cinemaWithSessions != null) {
+                    SessionList(viewModel, navController)
                 }
             }
         }
-        if (cinemaUiState.cinemaWithSessions != null) {
+
-            SessionList(viewModel, navController)
+        ApiStatus.LOADING -> LoadingPlaceholder()
-        }
+        else -> ErrorPlaceholder(
+            message = viewModel.apiError,
+            onBack = { navController.popBackStack() }
+        )
     }
 }

app/src/main/java/com/example/myapplication/database/entities/composeui/CinemaViewModel.kt

@@ -4,13 +4,13 @@ import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.setValue
 import androidx.lifecycle.SavedStateHandle
-import androidx.lifecycle.ViewModel
+import com.example.myapplication.composeui.MyViewModel
 import com.example.myapplication.database.entities.model.CinemaWithSessions
 import com.example.myapplication.database.entities.repository.CinemaRepository
 
 class CinemaViewModel(
     savedStateHandle: SavedStateHandle, private val cinemaRepository: CinemaRepository
-) : ViewModel() {
+) : MyViewModel() {
     private val cinemaUid: Int = checkNotNull(savedStateHandle["id"])
 
     var cinemaUiState by mutableStateOf(CinemaUiState())
@@ -18,7 +18,11 @@ class CinemaViewModel(
 
     suspend fun refreshState() {
         if (cinemaUid > 0) {
-            cinemaUiState = CinemaUiState(cinemaRepository.getCinema(cinemaUid))
+            runInScope(actionSuccess = {
+                cinemaUiState = CinemaUiState(cinemaRepository.getCinema(cinemaUid))
+            }, actionError = {
+                cinemaUiState = CinemaUiState()
+            })
         }
     }
 }

app/src/main/java/com/example/myapplication/database/entities/composeui/OrderListViewModel.kt

@@ -1,7 +1,7 @@
 package com.example.myapplication.database.entities.composeui
 
-import androidx.lifecycle.ViewModel
 import androidx.paging.PagingData
+import com.example.myapplication.composeui.MyViewModel
 import com.example.myapplication.database.entities.model.Order
 import com.example.myapplication.database.entities.repository.OrderRepository
 import kotlinx.coroutines.flow.Flow
@@ -9,10 +9,12 @@ import kotlinx.coroutines.flow.emptyFlow
 
 class OrderListViewModel(
     private val orderRepository: OrderRepository
-) : ViewModel() {
+) : MyViewModel() {
     var orderListUiState: Flow<PagingData<Order>> = emptyFlow()
 
     fun refreshState(userId: Int = 0) {
-        orderListUiState = orderRepository.getAllOrders(userId)
+        runInScope(actionSuccess = {
+            orderListUiState = orderRepository.getAllOrders(userId)
+        })
     }
 }

app/src/main/java/com/example/myapplication/database/entities/composeui/OrderView.kt

@@ -1,6 +1,5 @@
 package com.example.myapplication.database.entities.composeui
 
-import android.content.res.Configuration
 import android.graphics.BitmapFactory
 import androidx.compose.foundation.Image
 import androidx.compose.foundation.background
@@ -15,100 +14,98 @@ import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.foundation.lazy.items
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material3.MaterialTheme
-import androidx.compose.material3.Surface
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
-import androidx.compose.runtime.collectAsState
+import androidx.compose.runtime.LaunchedEffect
-import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableIntStateOf
-import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
-import androidx.compose.runtime.rememberCoroutineScope
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clip
 import androidx.compose.ui.graphics.asImageBitmap
-import androidx.compose.ui.tooling.preview.Preview
 import androidx.compose.ui.unit.dp
 import androidx.lifecycle.viewmodel.compose.viewModel
-import com.example.myapplication.ui.theme.PmudemoTheme
+import androidx.navigation.NavController
+import com.example.myapplication.api.ApiStatus
+import com.example.myapplication.composeui.ErrorPlaceholder
+import com.example.myapplication.composeui.LoadingPlaceholder
 import org.threeten.bp.format.DateTimeFormatter
 
 @Composable
 fun OrderView(
-    id: Int,
+    navController: NavController,
     viewModel: OrderViewModel = viewModel(factory = AppViewModelProvider.Factory)
 ) {
-    val coroutineScope = rememberCoroutineScope()
+    val orderUiState = viewModel.orderUiState
-    val orderUiState by viewModel.orderUiState.collectAsState()
-    LazyColumn(
-        modifier = Modifier
-            .padding(10.dp)
-    ) {
-        items(orderUiState.sessionList) { session ->
-            val count = remember { mutableStateOf(session.count) }
-            val dateFormatter = DateTimeFormatter.ofPattern("dd.MM.yyyy HH:mm")
-            val formattedDate = dateFormatter.format(session.dateTime)
 
-            Text(
+    LaunchedEffect(Unit) {
-                text = formattedDate,
+        viewModel.refreshState()
-                color = MaterialTheme.colorScheme.onBackground,
+    }
-            )
+    when (viewModel.apiStatus) {
-            Box(
+        ApiStatus.DONE -> {
+            LazyColumn(
                 modifier = Modifier
-                    .fillMaxWidth()
                     .padding(10.dp)
-                    .clip(RoundedCornerShape(16.dp))
-                    .background(MaterialTheme.colorScheme.secondary)
             ) {
-                Row(
+                items(orderUiState.sessionList) { session ->
-                    modifier = Modifier
+                    val count = remember { mutableIntStateOf(session.count) }
-                        .fillMaxWidth()
+                    val dateFormatter = DateTimeFormatter.ofPattern("dd.MM.yyyy HH:mm")
-                        .padding(8.dp),
+                    val formattedDate = dateFormatter.format(session.dateTime)
-                    verticalAlignment = Alignment.CenterVertically,
-                    horizontalArrangement = Arrangement.SpaceBetween
-                ) {
-                    if (session.cinema.image != null)
-                        Image(
-                            bitmap = BitmapFactory.decodeByteArray(
-                                session.cinema.image,
-                                0,
-                                session.cinema.image.size
-                            ).asImageBitmap(),
-                            contentDescription = null,
-                            modifier = Modifier
-                                .size(90.dp)
-                                .padding(4.dp)
-                        )
 
-                    Column(
+                    Text(
+                        text = formattedDate,
+                        color = MaterialTheme.colorScheme.onBackground,
+                    )
+                    Box(
                         modifier = Modifier
-                            .weight(1f)
+                            .fillMaxWidth()
-                            .padding(start = 8.dp),
+                            .padding(10.dp)
-                        verticalArrangement = Arrangement.spacedBy(4.dp)
+                            .clip(RoundedCornerShape(16.dp))
+                            .background(MaterialTheme.colorScheme.secondary)
                     ) {
-                        Text(
+                        Row(
-                            text = "${session.cinema.name}, ${session.cinema.year}\n" +
+                            modifier = Modifier
-                                    "Цена: ${session.frozenPrice}\n" +
+                                .fillMaxWidth()
-                                    "Количество: ${count.value}",
+                                .padding(8.dp),
-                            color = MaterialTheme.colorScheme.onSecondary
+                            verticalAlignment = Alignment.CenterVertically,
-                        )
+                            horizontalArrangement = Arrangement.SpaceBetween
+                        ) {
+                            if (session.cinema.image != null)
+                                Image(
+                                    bitmap = BitmapFactory.decodeByteArray(
+                                        session.cinema.image,
+                                        0,
+                                        session.cinema.image.size
+                                    ).asImageBitmap(),
+                                    contentDescription = null,
+                                    modifier = Modifier
+                                        .size(90.dp)
+                                        .padding(4.dp)
+                                )
+
+                            Column(
+                                modifier = Modifier
+                                    .weight(1f)
+                                    .padding(start = 8.dp),
+                                verticalArrangement = Arrangement.spacedBy(4.dp)
+                            ) {
+                                Text(
+                                    text = "${session.cinema.name}, ${session.cinema.year}\n" +
+                                            "Цена: ${session.frozenPrice}\n" +
+                                            "Количество: $count",
+                                    color = MaterialTheme.colorScheme.onSecondary
+                                )
+                            }
+                        }
                     }
                 }
             }
         }
-    }
-}
 
-
+        ApiStatus.LOADING -> LoadingPlaceholder()
-@Preview(name = "Light Mode", showBackground = true, uiMode = Configuration.UI_MODE_NIGHT_NO)
+        else -> ErrorPlaceholder(
-@Preview(name = "Dark Mode", showBackground = true, uiMode = Configuration.UI_MODE_NIGHT_YES)
+            message = viewModel.apiError,
-@Composable
+            onBack = { navController.popBackStack() }
-fun OrderViewPreview() {
+        )
-    PmudemoTheme {
-        Surface(
-            color = MaterialTheme.colorScheme.background
-        ) {
-            OrderView(id = 1)
-        }
     }
 }

app/src/main/java/com/example/myapplication/database/entities/composeui/OrderViewModel.kt

@@ -1,31 +1,29 @@
 package com.example.myapplication.database.entities.composeui
 
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.setValue
 import androidx.lifecycle.SavedStateHandle
-import androidx.lifecycle.ViewModel
+import com.example.myapplication.composeui.MyViewModel
-import androidx.lifecycle.viewModelScope
-import com.example.myapplication.database.AppContainer
 import com.example.myapplication.database.entities.model.SessionFromOrder
 import com.example.myapplication.database.entities.repository.OrderRepository
-import kotlinx.coroutines.flow.SharingStarted
-import kotlinx.coroutines.flow.StateFlow
-import kotlinx.coroutines.flow.flow
-import kotlinx.coroutines.flow.map
-import kotlinx.coroutines.flow.stateIn
 
 class OrderViewModel(
     savedStateHandle: SavedStateHandle,
     private val orderRepository: OrderRepository
-) : ViewModel() {
+) : MyViewModel() {
     private val orderUid: Int = checkNotNull(savedStateHandle["id"])
 
-    val orderUiState: StateFlow<OrderUiState> =
+    var orderUiState by mutableStateOf(OrderUiState())
-        flow { emit(orderRepository.getOrder(orderUid)) }.map {
+        private set
-            OrderUiState(it)
+
-        }.stateIn(
+    suspend fun refreshState() {
-            scope = viewModelScope,
+        runInScope(actionSuccess = {
-            started = SharingStarted.WhileSubscribed(stopTimeoutMillis = AppContainer.TIMEOUT),
+            orderUiState = OrderUiState(orderRepository.getOrder(orderUid))
-            initialValue = OrderUiState()
+        }, actionError = {
-        )
+            orderUiState = OrderUiState()
+        })
+    }
 }
 
 data class OrderUiState(val sessionList: List<SessionFromOrder> = listOf())

app/src/main/java/com/example/myapplication/database/entities/composeui/SessionListViewModel.kt

@@ -1,7 +1,7 @@
 package com.example.myapplication.database.entities.composeui
 
-import androidx.lifecycle.ViewModel
 import com.example.myapplication.LiveStore
+import com.example.myapplication.composeui.MyViewModel
 import com.example.myapplication.database.entities.model.Session
 import com.example.myapplication.database.entities.model.SessionFromCinema
 import com.example.myapplication.database.entities.model.UserSessionCrossRef
@@ -11,25 +11,35 @@ import com.example.myapplication.database.entities.repository.UserSessionReposit
 class SessionListViewModel(
     private val sessionRepository: SessionRepository,
     private val userSessionRepository: UserSessionRepository
-) : ViewModel() {
+) : MyViewModel() {
     suspend fun deleteSession(session: SessionFromCinema) {
-        sessionRepository.deleteSession(
+        runInScope(actionSuccess = {
-            Session(
+            sessionRepository.deleteSession(
-                uid = session.uid,
+                Session(
-                dateTime = session.dateTime,
+                    uid = session.uid,
-                price = session.price,
+                    dateTime = session.dateTime,
-                maxCount = 0,
+                    price = session.price,
-                cinemaId = 0
+                    maxCount = 0,
+                    cinemaId = 0
+                )
             )
-        )
+        })
     }
 
     suspend fun addSessionInCart(sessionId: Int, count: Int = 1) {
-        try {
+        val userId: Int = LiveStore.user.value?.uid ?: return
-            val userId: Int = LiveStore.user.value?.uid ?: return
+        runInScope(actionSuccess = {
-            userSessionRepository.insertUserSession(UserSessionCrossRef(userId, sessionId, count))
+            try {
-        } catch (_: Exception) {
+                userSessionRepository.insertUserSession(
+                    UserSessionCrossRef(
+                        userId,
+                        sessionId,
+                        count
+                    )
+                )
+            } catch (_: Exception) {
 
-        }
+            }
+        })
     }
 }

app/src/main/java/com/example/myapplication/database/entities/composeui/UserProfile.kt

@@ -34,6 +34,7 @@ import androidx.compose.ui.unit.dp
 import androidx.lifecycle.viewmodel.compose.viewModel
 import androidx.navigation.NavController
 import com.example.myapplication.LiveStore
+import com.example.myapplication.composeui.navigation.Screen
 import com.example.myapplication.datastore.DataStoreManager
 import kotlinx.coroutines.launch
 
@@ -47,11 +48,15 @@ fun UserProfile(
     var isRegistration by remember { mutableStateOf(false) }
     val coroutine = rememberCoroutineScope()
     val errorStringId: Int? = viewModel.userUiState.errorId
-    val errorMessage = if (errorStringId == null) "" else stringResource(errorStringId)
+    val errorMessage =
+        if (errorStringId == null || errorStringId == 0) "" else stringResource(errorStringId)
     val user = LiveStore.user.observeAsState()
 
     LazyColumn {
         item {
+            if (errorStringId == 0) {
+                navController.navigate(Screen.CinemaList.route)
+            }
             if (user.value != null) {
                 Column(
                     modifier = Modifier
@@ -151,7 +156,7 @@ fun UserProfile(
 
                     if (isRegistration) {
                         Button(
-                            onClick = { coroutine.launch { isRegistration = !viewModel.signUp() } },
+                            onClick = { coroutine.launch { viewModel.signUp() } },
                             modifier = Modifier
                                 .fillMaxWidth()
                                 .padding(8.dp)
@@ -169,13 +174,7 @@ fun UserProfile(
                         )
                     } else {
                         Button(
-                            onClick = {
+                            onClick = { coroutine.launch { viewModel.signIn(dataStoreManager) } },
-                                coroutine.launch {
-                                    if (viewModel.signIn(dataStoreManager)) {
-                                        navController.popBackStack()
-                                    }
-                                }
-                            },
                             modifier = Modifier
                                 .fillMaxWidth()
                                 .padding(8.dp)

app/src/main/java/com/example/myapplication/database/entities/composeui/UserProfileViewModel.kt

@@ -1,17 +1,19 @@
 package com.example.myapplication.database.entities.composeui
 
+import android.widget.Toast
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.setValue
-import androidx.lifecycle.ViewModel
+import com.example.myapplication.MainComposeActivity
 import com.example.myapplication.R
+import com.example.myapplication.composeui.MyViewModel
 import com.example.myapplication.database.entities.model.User
 import com.example.myapplication.database.entities.repository.UserRepository
 import com.example.myapplication.datastore.DataStoreManager
 
 class UserProfileViewModel(
     private val userRepository: UserRepository
-) : ViewModel() {
+) : MyViewModel() {
     var userUiState by mutableStateOf(UserUiState())
         private set
 
@@ -22,43 +24,62 @@ class UserProfileViewModel(
         )
     }
 
-    suspend fun signIn(dataStoreManager: DataStoreManager): Boolean {
+    suspend fun signIn(dataStoreManager: DataStoreManager) {
         userUiState.details.passwordConfirm = userUiState.details.password
         var errorId: Int? = validateInput(userUiState.details)
-        if (errorId == null) {
+        runInScope(
-            val overlap = userRepository.getUser(userUiState.details.login)
+            actionSuccess = {
-            if (overlap == null || userUiState.details.password != overlap.password) {
+                if (errorId == null) {
-                errorId = R.string.err_04
+                    val overlap: User? = userRepository.getUser(userUiState.details.login)
-            }
+                    if (overlap == null || userUiState.details.password != overlap.password) {
-        }
+                        errorId = R.string.err_04
-        userUiState = UserUiState(
+                    } else {
-            details = userUiState.details,
+                        dataStoreManager.setLogin(userUiState.details.login)
-            errorId = errorId
+                        errorId = 0
-        )
+                    }
-        if (errorId == null) {
+                }
-            dataStoreManager.setLogin(userUiState.details.login)
+                userUiState = UserUiState(
-            return true
+                    details = userUiState.details,
-        }
+                    errorId = errorId
-        return false
+                )
+            }, actionError = {
+                errorId = R.string.err_06
+                userUiState = UserUiState(
+                    details = userUiState.details,
+                    errorId = errorId
+                )
+            })
     }
 
-    suspend fun signUp(): Boolean {
+    suspend fun signUp() {
         var errorId: Int? = validateInput(userUiState.details)
-        if (errorId == null) {
+        runInScope(actionSuccess = {
-            val overlap = userRepository.getUser(userUiState.details.login)
+            if (errorId == null) {
-            if (overlap != null) {
+                val overlap = userRepository.getUser(userUiState.details.login)
-                errorId = R.string.err_03
+                if (overlap != null) {
+                    errorId = R.string.err_03
+                }
             }
-        }
+            userUiState = UserUiState(
-        userUiState = UserUiState(
+                details = userUiState.details,
-            details = userUiState.details,
+                errorId = errorId
-            errorId = errorId
+            )
-        )
+            if (errorId == null) {
-        if (errorId == null) {
+                userRepository.insertUser(userUiState.details.toUser())
-            userRepository.insertUser(userUiState.details.toUser())
+                val toast = Toast.makeText(
-            return true
+                    MainComposeActivity.appContext,
-        }
+                    "Вы зарегистрированы",
-        return false
+                    Toast.LENGTH_SHORT
+                )
+                toast.show()
+            }
+        }, actionError = {
+            errorId = R.string.err_06
+            userUiState = UserUiState(
+                details = userUiState.details,
+                errorId = errorId
+            )
+        })
     }
 
     private fun validateInput(details: UserDetails = userUiState.details): Int? {

app/src/main/java/com/example/myapplication/database/entities/composeui/edit/CinemaEdit.kt

@@ -22,6 +22,9 @@ import androidx.compose.ui.unit.dp
 import androidx.lifecycle.viewmodel.compose.viewModel
 import androidx.navigation.NavController
 import com.example.myapplication.R
+import com.example.myapplication.api.ApiStatus
+import com.example.myapplication.composeui.ErrorPlaceholder
+import com.example.myapplication.composeui.LoadingPlaceholder
 import com.example.myapplication.database.entities.composeui.AppViewModelProvider
 import com.example.myapplication.ui.theme.PmudemoTheme
 import kotlinx.coroutines.launch
@@ -32,17 +35,25 @@ fun CinemaEdit(
     viewModel: CinemaEditViewModel = viewModel(factory = AppViewModelProvider.Factory),
 ) {
     val coroutineScope = rememberCoroutineScope()
-
+    when (viewModel.apiStatus) {
-    CinemaEdit(
+        ApiStatus.DONE -> {
-        cinemaUiState = viewModel.cinemaUiState,
+            CinemaEdit(
-        onClick = {
+                cinemaUiState = viewModel.cinemaUiState,
-            coroutineScope.launch {
+                onClick = {
-                viewModel.saveCinema()
+                    coroutineScope.launch {
-                navController.popBackStack()
+                        viewModel.saveCinema()
-            }
+                        navController.popBackStack()
-        },
+                    }
-        onUpdate = viewModel::updateUiState,
+                },
-    )
+                onUpdate = viewModel::updateUiState,
+            )
+        }
+        ApiStatus.LOADING -> LoadingPlaceholder()
+        else -> ErrorPlaceholder(
+            message = viewModel.apiError,
+            onBack = { navController.popBackStack() }
+        )
+    }
 }
 
 @Composable

app/src/main/java/com/example/myapplication/database/entities/composeui/edit/SessionEdit.kt

@@ -24,6 +24,9 @@ import androidx.compose.ui.unit.dp
 import androidx.lifecycle.viewmodel.compose.viewModel
 import androidx.navigation.NavController
 import com.example.myapplication.R
+import com.example.myapplication.api.ApiStatus
+import com.example.myapplication.composeui.ErrorPlaceholder
+import com.example.myapplication.composeui.LoadingPlaceholder
 import com.example.myapplication.database.entities.composeui.AppViewModelProvider
 import kotlinx.coroutines.launch
 import org.threeten.bp.Instant
@@ -39,16 +42,26 @@ fun SessionEdit(
     viewModel: SessionEditViewModel = viewModel(factory = AppViewModelProvider.Factory),
 ) {
     val coroutineScope = rememberCoroutineScope()
-    SessionEdit(
+    when (viewModel.apiStatus) {
-        sessionUiState = viewModel.sessionUiState,
+        ApiStatus.DONE -> {
-        onClick = {
+            SessionEdit(
-            coroutineScope.launch {
+                sessionUiState = viewModel.sessionUiState,
-                viewModel.saveSession()
+                onClick = {
-                navController.popBackStack()
+                    coroutineScope.launch {
-            }
+                        viewModel.saveSession()
-        },
+                        navController.popBackStack()
-        onUpdate = viewModel::updateUiState
+                    }
-    )
+                },
+                onUpdate = viewModel::updateUiState
+            )
+        }
+
+        ApiStatus.LOADING -> LoadingPlaceholder()
+        else -> ErrorPlaceholder(
+            message = viewModel.apiError,
+            onBack = { navController.popBackStack() }
+        )
+    }
 }
 
 fun Long.toLocalDate(): org.threeten.bp.LocalDate {

app/src/main/res/values/strings.xml

@@ -25,6 +25,7 @@
     <string name="err_03">Логин занят</string>
     <string name="err_04">Неверный логин или пароль</string>
     <string name="err_05">Не совпадают пароли</string>
+    <string name="err_06">Ошибка сети</string>
     <string name="back">Назад</string>
     <string name="loading">Загрузка…</string>
 </resources>